Thomas f



T. F. DEPUY .un PREHEATING MEANS Fon soun FUELBURNING sTovEs Filed April18, 1922 y.1.

MarQS, 1925.l

ATTORNEY.

Patented Mar. 3, 1925.

i UNITED .STATES 1,528,048 PMI-:NTv -oFFlcaf THoMAs rj DEPUY, or` MAUCHGHUNIL PENNSYLVANIA, AssIeNoR tro LEHIGH srovn AND MANUFACTURINGCOMPANY, or LEHIGHTON, PENNSYLVANIA, A GOR- f f PORATION 0FPENNSYLVANIA.

AIR-PREHEATING FOR SOLIDfFUEL-BUR-NING STOVES.

'Appnc'ationmeaaprn 1s, 1922.- A seriaiNo. 555,163. l

To all whom t may concern: L

Be it known that I, THoMAs F. DEPUY, a citizen of the United States, anda resident ofv Mauch Chunk,v in the county of Carbon andState ofPennsylvania, have invented an Improvement in Air-PreheatingMeans forSolidFue`l-Burningv Stoves,'of which the following is a specification. v

In the case Aof solid .fuel burning stoves of certain types and kinds,for' instance, cooking stoves, itis desirable that means be provided forcausing relatively quick' ignition ofthe fuel atcert'ain points orwithin certain regions adjacent some partl or compartment of thel lstovewhich should be quickly heated. v Y Y he object broadlyfof myinvent-ion'is to provide means whereby portionsV of theV fuel Y at certainselected points orwithin a selected predetermined region may be morequickly ignited than would be the case if the device embodying Vmyinvention were. not present. Vj VAmore specific object of lmyinventionis to provide. means whereby air Ymay be cheaplyandV economicallypre-heated and -admittedto the said selected predetermined region withinthe fire box. u i

A further general object of the invention is to provide a deviceof thecharacter indicated which is simple in construction and which may becheaply yand economically manufacturedand placed in use.y Y

In order that the invention Vmay be readily Aunderstoodand itspractical` advantages fully appreciated, reference shouldbe had to theaccompanying drawing in which I lhave illustrated one form -of.embodiment of the.V device. embodying 'the said invention; but it willbe understood thatthe `invention -is susceptible of embodiment in` formsof Yconstructionother than that shownv and that changes in the detailsofvconstruction mayY be made within the scope..of'the claimsv Fig. 3 isa view in side elevation of the said device looking toward the left inFig. 1; and f Fig. t is a horizontal sectional view of the said devicetaken on the line L1-4t of Fig. 1.

It will be noticed that I have shown my invention as applied to orembodied ina cook stove, but it will be understood that it may beapplied to 4other kinds of stoves should suchV application becomedesirable.

Referring to the drawings: 1 designates the firebox ofa solid fuelburning stove Vand2 the fuel therein. The grate for supporting thefuelis not shown. At one side ofthe fire box 'a water holding and heatingreceptacle 8 is shown by means of which a supply of heated water may beprovided. The said wat-er heating receptacle 3 is supportedl against anouter wall structure 4 of the stove. The air for effecting vandcontrolling combustion of the fuel 2 issupvplied througha controllabledraught openling in .the side of the stove.. The heated gases-emittedfrom the lire box 'or combustion' chamber travel therefrom upwardly andlaterally through a passageway?w and thence around the oven 8 in knownmanner.

The device embodying-my invention is situated intermediate the fire boxor chamberl and the wall 10 ofthe oven 8l adjacent the fire box orcombustion chamber and is secured to said wall by a bolt 10a. The saiddevice 'constitutes the lower ipart ofthe sideof the fire vbox orchamber adjacent said oven. The said device comprises a .box-like.memberhaving a bottom 11, upper and lower sides 12 and 13 and end walls14. f The outer or top edges of the .upper andv lower sides 12 and 13`and the .end walls 1t contactfwith the adjacent wall 10 offtheoven 8 toform an air chamber, as clearly shown in Fig. 1. The .lower side 13 lofthe device is provided with a down- .at its opposite ends inoutwardlyextending projections 16.V These projections extend.

yunderneath a shoulder 17 formed in the wall 10 of the oven 8 and theouter edges wardly extending portion 15 terminated thereof contact withvthe botto-m of an inwardly depressed portion vof said wall so .as tojform a channel 18 leadingfrom the ash.. pit chamber below the fire boxintothe Asaid air chamber.

. Al portion of the bottom 11 of the said device a distance above theupper edge thereof extends inwardly toward the wall l() as indicated at2O so as to form a shoulder 2l which extends lengthwise of the saiddevice and in parallel relation to the top side wall l2 thereof. Thesaid shoulder is provided with openings 22 at intervals therein throughwhich the air is adapted to flow from the chamber within the said deviceinto the fire box or chamber. The direction of flow is indicated by thearrows 23 in lTig` l. The bottom ll of the said device is situated indirect contact with the lower inside portion of the burning fuel 2within the fire box or chamber l and in consequence is quickly heated sothat the air which enters the air chamber is pre-heated.

The top side 12 of the pre-heating device constitutes a support for theinsulating lining 25 situated intermediate the fire box or chamber' land the upper portion of the side wall 10 of the oven 8. This lining, inthe construction shown, consists of firebrick. The lower edge of thislining is retained in position by means of the shoulder or flange-likeportion 26 which projects upwardly in the plane of the bottoni ll of thepre-heating device, as clearly shown in Fig, l of the drawing.

Assuming that a fire has been started within the fire box or chamber,the bottom portion of the coal is first ignited. The hot gases flow ortravel upwardly through the bed of coal or other solid fuel andultimately the entire )bed becomes ignited. Vithout the presence of adevice'such as that constituting my invention disclosed herein theentire bed of solid fuel would become ignited progressively from thebottom upwardly, but it is desirable that the portion of fuel adjacentthe oven should be ignited more quickly than usually is the case inorder that the oven may become more quickly heated. lt is for thepurpose of accomplishing this result that my invention has beenprovided. VAs already indicated, the bottom portion of the fuel is firstignited, consequently the device constituting my invention and whichco-operates with the adjacent inner wall of the oven to form apre-heating air chamber becomes quickly heated so that the air enteringthe said chamber through the channel 18 is likewise quickly heated andin its heated state is delivered through the openings 22 into fuel 2 inthe hre box or cham# ber 'l at a point a considerable distance above thebottom thereof. rlhe said preheated air flows upwardly through the fueladjacent the fire-brick 25 and, by reason of having been pre-heated, isquickly ignited. It'follows that the fuel within the region adjacent theoven above the point of delivery of the pre-heated'air into the lire boxer chamber is quickly ignited so that the oven is more quickly heatedthan would be the case if the device embodying my invention were notemployed. By this means a substantial economy in time may be effected aswell as a more satisfactory combustion of the fuel.

Having thus described my invention what I claim and desire to secure byLetters Pate-nt is:

l. A solid fuel burning stove comprising a fuel chamber, the lowerportion of the side of which adjacent the oven chamber consists of abox-like member, the bottom of which faces the fuel chamber and thesides and ends of which extend toward the said oven chamber, means fordetachably securing the said box-like member to said oven chamber withthe edges of said member in contact with a side wall of said ovenchamber, the lower side wall of said box-like member being provided withan opening through which air is adapted toenter the chamber f-ormed between'the said box-like member and the adjacent wall of the said ovenchamber, and the bottom of said boxlike member being provided withopenings through which pre-heated air is adapted to be discharged fromthe chamber formed by the said box-like member and the adjacent sidewall of the said oven chamber into the fuel chamber at a point adistance above the bottom of the fuel chamber below the normal top levelof the bed of fuel therein.

2. A solid fuel burning stove comprising a device of box-shape havingbottom, side and end walls, the edges of which are adapted to contactwith the outer side of the inner wall of a chamber to be heated, thelower side of the said device having outwardly and downwardly extendingprojections to form a channel through which air is adapted to enter thechamber within said device and a portion of the bottom of said device adistance above the lower edge thereof being ex tended inwardly to forma. shoulder which extends in parallel spaced relation with respect tothe upper side of said device and the said shoulder being provided withopenings therethrough for vthe passage of air from the chamber withinsaid device into the lire box or chamber.

3. A solid fuel burning stove comprising an open box-shaped device,means for securing the said device to a. wall of the said stove with itsedges seated against said wall to form a closed chamber within the saidvdevice, the said device constituting the lower "portion of one oftheside walls of the fire box of said stove, and the lower side of saiddevice being provided with depending and outwardly extending projectionsto form a channel for the passage of air into the chamber within thesaid deviceV and the `bottom of the said device a distance above itslower edge being extended inwardly to form a shoulder having openingstherein which openings open downwardly for the passage of pre-heated airfrom the said chamber into the fire boX, substantially as and for thepurpose described.

4f. In a solid fuel burning stove comprising an oven and a fire box, thecombination of an open box-like lneniber, vthe edges of which contactwith the outer side of the wall of the said oven which is adjacent thefire box, ineans for securing the said device to and holding it againstAthe said wall, the lower side of the said device being provided withinwardly and downwardly extending projections to form a channel for theadmission of air into the chamber within the Said device and the bottomof the said device a distance above its lower edge extending inwardly`to Jform a shoulder in spaced relation to the upper side of said devicewhich shoulder is provided with openings eX- tending therethrough, aninsulating lining supported uponl the upper side of said device andsituated between the combustion chamber and lthe adjacent wall 'of thesaid oven, substantially as described.

In testimony that I claim the foregoing as my invention I have hereuntosigned my name this 17 day of April, 1922.

THOS, F. DEPUY.

